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  <title>Read file stream asynchronously</title>
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  <div id="layout-content"><div id="function.swoole-async-read" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">swoole_async_read</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.2.0, PHP 7, PECL swoole &gt;= 1.9.0)</p><p class="refpurpose"><span class="refname">swoole_async_read</span> &mdash; <span class="dc-title">Read file stream asynchronously</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-function.swoole-async-read-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>swoole_async_read</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$filename</code></span>
   , <span class="methodparam"><span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span> <code class="parameter">$callback</code></span>
   [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$chunk_size</code><span class="initializer"> = 65536</span></span>
   [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</code><span class="initializer"> = 0</span></span>
  ]] ) : <span class="type">bool</span></div>

  <p class="para rdfs-comment">

  </p>

 </div>


 <div class="refsect1 parameters" id="refsect1-function.swoole-async-read-parameters">
  <h3 class="title">参数</h3>
  <dl>

   
    <dt>
<code class="parameter">filename</code></dt>

    <dd>

     <p class="para">
      The filename of the file being read.
     </p>
    </dd>

   
   
    <dt>
<code class="parameter">callback</code></dt>

    <dd>

     <div class="methodsynopsis dc-description">
       <span class="methodname"><span class="replaceable">callback</span></span>
        ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$filename</code></span>
       , <span class="methodparam"><span class="type">string</span> <code class="parameter">$content</code></span>
       ) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span></div>

      <dl>

       
        <dt>
<code class="parameter">filename</code></dt>

        <dd>

         <p class="para">
          The name of the file.
         </p>
        </dd>

       
       
        <dt>
<code class="parameter">content</code></dt>

        <dd>

         <p class="para">
          The content readed from the file stream.
         </p>
        </dd>

       
      </dl>

    </dd>

   
   
    <dt>
<code class="parameter">chunk_size</code></dt>

    <dd>

     <p class="para">
      The chunk length.
     </p>
    </dd>

   
   
    <dt>
<code class="parameter">offset</code></dt>

    <dd>

     <p class="para">
      The offset.
     </p>
    </dd>

   
  </dl>

 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.swoole-async-read-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Whether the read is succeed.
  </p>
 </div>


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